Muscles of the Forearm and Hand
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1 8 Muscles of the Forearm and Hand
2 132 PRONATOR TERES Strengthening exercises Pronation with strength bar Self stretches Weight of stick increases supination via gravity
3 PRONATOR TERES 133 Latin, pronate, bent forward; teres, rounded, finely shaped. Origin Humeral head: lower third of medial supracondylar ridge and the common flexor origin on the anterior aspect of the medial epicondyle of humerus. Ulnar head: medial border of the coronoid process of the ulna. Insertion Mid-lateral surface of radius (pronator tuberosity). Action Pronates forearm. Assists flexion of elbow joint. Nerve Median nerve, C6, 7. Basic functional movement Examples: Pouring liquid from a container. Turning a doorknob. Indications Pain in wrist (lateral). Pain on supination. Hairdressers (over use of scissors). Inability to cup hands together, esp. cupping and extension of the wrist. Shoulder pain (compensatory). Wrist pain on driving. Referred pain patterns Strong pain deep into palmar region of the wrist (lateral) radiating up the antero-lateral forearm. Differential diagnosis De Quervain s tenosynovitis. Carpal tunnel swelling. Osteoarthritis of proximal thumb joint. Distal radio-ulnar discopathy. Epicondylitis. Also consider Finger flexors. Scalenes. Pectoralis major. Advice to patient Stretching techniques. Self massage. Change grip and techniques in tennis / golf. Review driving posture, and grip on steering wheel. Techniques Spray and stretch Dry needling Injections Trigger point release
4 134 PALMARIS LONGUS Strengthening exercises Biceps curl Palmaris longus Wrist rolling (palm up) Wrist curl Self stretches Use one hand to gently lever the other wrist into extension.
5 PALMARIS LONGUS 135 Latin, palmaris, palma, palm; longus, long. Part of the superficial layer, which also includes: pronator teres, flexor carpi radialis, and flexor carpi ulnaris. The palmaris longus muscle is absent in 13% of the population. Origin Common flexor origin on the anterior aspect of the medial epicondyle of humerus. Insertion Superficial (front) surface of flexor retinaculum and apex of the palmar aponeurosis. Action Flexes the wrist. Tenses the palmar fascia. Nerve Median nerve C(6), 7, 8, T1. Basic functional movement Examples: Grasping a small ball. Cupping the palm to drink from the hand. Indications Pain and soreness in palm of hand. Tenderness in hand / palm. Functional loss of power in grip. Tennis elbow. Referred pain patterns Diffuse pain in anterior forearm; intense pain zone 2 3cm in palm of hand surrounded by a superficial zone of prickling and needle-like sensations. Differential diagnosis Neurogenic pain. Dupuytren s contracture. Carpal tunnel syndrome. Complex regional pain syndrome (reflex sympathetic dystrophy). Scleroderma. Dermatomyositis. Also consider Flexor carpi radialis. Brachialis. Pronator teres. Wrist joints (carpals). Triceps brachii. Advice to patient Avoid prolonged gripping especially power tools, often seen in massage therapists. Stretching and heat. Regular breaks. Techniques Spray and stretch Dry needling Injections Trigger point release
6 136 WRIST FLEXORS Flexor digitorum superficialis (cut) Strengthening exercises Biceps curl Flexor pollicis longus Flexor digitorum profundus Flexor carpi radialis Flexor carpi ulnaris Wrist rolling (palm up) Wrist curl Self stretches (radial head) (humeral head) Flexor digitorum superficialis and profundus Use one hand to gently lever the other wrist into extension. Flexor carpi radialis Flexor carpi ulnaris
7 WRIST FLEXORS 137 Latin, flex, to bend; carpi, of the wrist; radius, staff, spoke of wheel; ulnaris, of the elbow / arm; digit, finger; superficialis, on the surface; profundus, deep. Flexor carpi radialis, flexor carpi ulnaris, flexor digitorum superficialis, and flexor digitorum profundus. Origin Common flexor origin on the anterior aspect of the medial epicondyle of humerus (i.e. lower medial end of humerus). Insertion Carpals, metacarpals, and phalanges. Action Flex the wrist joint. (Flexor carpi radialis also abducts the wrist; flexor carpi ulnaris also adducts the wrist). Nerve Median nerve, C6, 7, 8, T1 Basic functional movement Examples: Pulling rope in towards you. Wielding an axe or hammer. Pouring liquid from bottle. Turning door handle. Indications Hand, wrist, and finger pain. Trigger finger. Cutting with scissors. Gripping. Golfer s elbow. Repetitive strain injury. Hairdressers. Turning hand to cupping action. Tense finger flexors. Referred pain patterns Individual muscles refer to the lower arm, wrist, hand, and fingers (see diagrams). Differential diagnosis Ulnar neuritis. Cervical neuropathies. Carpal bone dysfunctions. De Quervain s tenosynovitis. Repetitive strain injury. Osteo- and rheumatoid arthritis. Radio-ulnar disc (distal) problems. Carpal tunnel syndrome. Medial epicondylitis. Also consider Shoulder muscles. Upper arm muscles. Scalenes. Flexor pollicis longus. Advice to patient Avoid prolonged gripping. Avoid repeated twisting (screwdriver). Change golf grip. Take regular breaks. Regular finger stretching. Techniques Spray and stretch Dry needling Injections Trigger point release
8 138 BRACHIORADIALIS Strengthening exercises Biceps curl Chin-ups Upright rowing Self stretch Pronate and supinate forearm.
9 BRACHIORADIALIS 139 Latin, brachial, relating to the arm; radius, staff, spoke of wheel. Part of the superficial group. The brachioradialis forms the lateral border of the cubital fossa. The muscle belly is prominent when working against resistance. Origin Upper two-thirds of the anterior aspect of lateral supracondylar ridge of humerus (i.e. lateral part of shaft of humerus, 5 7.5cm (2 3 ) above elbow joint). Insertion Lower lateral end of radius, just above the styloid process. Action Flexes elbow joint. Assists in pronating and supinating forearm when these movements are resisted. Nerve Radial nerve, C5, 6. Basic functional movement Example: Turning a corkscrew. Indications Elbow pain. Pain in thumb (dorsum). Tennis elbow (lateral epicondylitis). Weakness in grip. Repetitive strain injury. Referred pain patterns Lateral epicondyle area 3 4cm patch with vague arm pain (radius border), localizing into strong pain dorsum of thumb. Differential diagnosis De Quervain s tenosynovitis. Osteoarthritis of thumb (trapezium). Also consider Biceps brachiii. Brachialis. Extensor carpi radialis longus, and brevis. Supinator. Extensor digitorum. Advice to patient Avoid long standing. Carrying (briefcases). Take regular breaks when typing. Use wrist supports. Change grip on tennis raquet. Techniques Spray and stretch Dry needling Injections Trigger point release
10 140 WRIST EXTENSORS Strengthening exercises Wrist roller (palms down) Extensor carpi radialis longus Extensor carpi radialis brevis Extensor carpi ulnaris Reverse wrist curl Self stretches Use lower hand to gently lever the other wrist into flexion.
11 WRIST EXTENSORS 141 Latin, extensor, to extend; carpi, of the wrist; radius, staff, spoke of wheel; longus, long; brevis, short; ulnaris, of the elbow. Includes extensor carpi radialis longus and brevis, and extensor carpi ulnaris. Origin Common extensor tendon from lateral epicondyle of humerus (i.e. lower lateral end of humerus). Insertion Dorsal surface of metacarpal bones. Action Extends the wrist (extensor carpi radialis and brevis also abduct the wrist; extensor carpi ulnaris also adducts the wrist). Nerve Radialis longus and brevis: radial nerve, C5, 6, 7, 8. Extensor carpi ulnaris: deep radial (posterior interosseous) nerve, C5, 6, 7, 8. Basic functional movement Examples: Kneading dough. Typing. Cleaning windows. Indications Forearm, elbow, wrist, and hand pain. Finger stiffness. Painful / weak grip. Tennis elbow. Pain on gripping and twisting, seen in musicians / athletes / long distance drivers. Loss of control (fine) on gripping activities. Referred pain patterns Extensor carpi radialis longus: strong 2 3cm zone over lateral epicondyle, diffusely radiating to dorsum of hand above thumb. Extensor carpi radialis brevis: strong zone of pain 3 5cm over dorsum of hand. Extensor carpi ulnaris: strong localized specific referral to dorsal ulnar surface of hand, and bulk of wrist. Differential diagnosis Epicondylitis. C6 C6 radiculopathy. De Quervain s tenosynovitis. Articular dysfunction of wrist. Osteoarthritis. Carpal tunnel syndrome. Also consider Supinator. Brachioradialis. Extensor digitorum. Triceps brachii. Biceps brachii. Anconeus. Advice to patient Avoid over gripping in sports. Take regular breaks / rests when gardening / driving. Explore occupational factors / ergonomics. Home stretch and exercises. Change grip width in golf / tennis. Use of wrist splints. Techniques Spray and stretch Injections Dry needling Trigger point release
12 142 EXTENSOR DIGITORUM Strengthening exercise Exer. ring finger extension Self stretches Use one hand to gently lever the other wrist and therefore fingers into extension. Middle finger extensor Ring finger extensor
13 EXTENSOR DIGITORUM 143 Latin, extensor, to extend; digit, finger. Part of the superficial group. Each tendon of extensor digitorum, over each metacarpophalangeal joint, forms a triangular membranous sheet called the extensor hood or extensor expansion, into which inserts the lumbricales and interossei of the hand. Extensor digiti minimi and extensor indicis also insert into the extensor expansion. Origin Common extensor tendon from lateral epicondyle of humerus (i.e. lower lateral end of humerus). Insertion Dorsal surfaces of all the phalanges of the four fingers. Action Extends the fingers (metacarpophalangeal and interphalangeal joints). Assists abduction (divergence) of fingers away from the middle finger. Nerve Deep radial (posterior interosseous) nerve, C6, 7, 8. Basic functional movement Example: Letting go of objects held in the hand. Indications Finger, hand, and wrist pain. Elbow pain. Stiffness and pain in fingers. Weakness in fingers (decreased grip). Tennis elbow. Pain on forceful gripping, often seen in professional musicians (esp. guitarists). Referred pain patterns Diffuse pain from forearm becoming more intense in the appropriate finger (proximal metacarpal). Pain in lateral epicondyle. Differential diagnosis Radiculopathy (cervical). Epicondylitis (tennis elbow). Osteoarthritis of fingers. De Quervain s tenosynovitis. Mechanical wrist pain (carpals). Also consider Brachioradialis. Supinator. Extensor carpi radialis longus. Extensor indicis. Advice to patient Home exercise programme. Self stretch. Avoid sustained gripping. Explore work posture / arrangement with reference to computer keyboards / mouse. Avoid habitual postures such as sleeping with hands folded under head / pillow. Techniques Spray and stretch Injections Dry needling Trigger point release
14 144 SUPINATOR Strengthening exercise Dumb-bell biceps curl Self stretch Weight of stick increases pronation via gravity.
15 SUPINATOR 145 Latin, supinus, lying on the back. Part of the deep group. Supinator is almost entirely concealed by the superficial muscles. Origin Lateral epicondyle of humerus. Radial collateral (lateral) ligament of elbow joint. Annular ligament of superior radio-ulnar joint. Supinator crest of ulna. Insertion Dorsal and lateral surfaces of upper third of radius. Action Supinates forearm (for which it is probably the main prime mover; with biceps brachii being an auxiliary). Nerve Deep radial nerve, C5, 6, (7). Basic functional movement Example: Turning a door handle, or screwdriver. Indications Tennis elbow. Thumb joint pain. Elbow pain (when carrying and at rest). Pain turning door knobs. Localized pain on supination. Chronic use of walking stick. Pain on handshake. Referred pain patterns Localized 3 5cm strong zone of pain at lateral epicondyle and at web of thumb (dorsum). Differential diagnosis De Quervain s tenosynovitis. Lateral epicondylitis (tendino-osseous, musculo-tendinous, intramuscular). Radial head dysfunction. Also consider Common extensors. Biceps brachii. Triceps brachii (insertion). Anconeus. Brachialis. Palmaris longus. Brachioradialis. Extensor carpi radialis longus. Advice to patient Change tennis style (keep wrists dorsiflexed). Change grip size. Avoid prolonged gripping / carrying. Change walking stick side regularly. Use pressure bandage / strap. Use backpack. Techniques Spray and stretch Dry needling Injections Trigger point release
16 146 OPPONENS POLLICIS / ADDUCTOR POLLICIS Strengthening exercises Opponens pollicis Adductor pollicis Exer. ring pinching exercise Self stretches Gently pull thumb into extension Opponens pollicis Adductor pollicis
17 OPPONENS POLLICIS / ADDUCTOR POLLICIS 147 Latin, opponens, opposing; pollicis, of the thumb; adduct, toward. Opponens pollicis is part of the thenar eminence, usually partly fused with flexor pollicis brevis and deep to abductor pollicis brevis. Origin Opponens pollicis: flexor retinaculum. Tubercle of trapezium. Adducor pollicis: oblique fibres: anterior surfaces of second and third metacarpals, capitate and trapezoid. Transverse fibres: palmar surface of third metacarpal bone. Insertion Opponens pollicis: entire length of radial border of first metacarpal. Adductor pollicis: ulna (medial) side of base of proximal phalanx of thumb. Action Opponens pollicis: opposes (i.e. abducts, then slightly medially rotates, followed by flexion and adduction) the thumb so that the pad of the thumb can be drawn into contact with the pads of the fingers. Adductor pollicis: adducts the thumb. Nerve Opponens pollicis: median nerve (C6, 7, 8, T1) Adductor pollicis: deep ulnar nerve, C8, T1. Basic functional movement Example: Picking up small object between thumb and fingers (opponens pollicis). Gripping a jam jar lid to screw it on (adductor pollicis). Indications Weeder s thumb. Thumb pain on activity. Difficulty on maintaining pincer movement. Texter s, and video gamer s thumb. Pain on sewing, writing, and opening jars. Loss of fine motor control in buttoning, sewing, writing, and painting, etc. Referred pain patterns Opponens pollicis: palmar wrist pain at distal radial head and into palmar aspect of thumb. Adductor pollicis: dorsal and palmar surfaces of thumb localized around metacarpophalangeal joint and radiating to web of thumb and thenar eminence. Differential diagnosis De Quervain s tenosynovitis. Osteoarthritis of thumb (saddle joint). Rheumatoid arthritis. Carpal tunnel syndrome. Trigger thumb. Discopathy of distal radio-ulnar joint. Carpal bones dysfunction. Mechanical dysfunction. Fracture. Subluxation. Also consider Abductor pollicis brevis. Flexor pollicis brevis. Flexor pollicis longus. Advice to patient Home stretching exercises. Take regular breaks. Ergonomic pens, etc. Use warmth. Techniques Spray and stretch Dry needling Injections Trigger point release
18 148 SMALL HAND MUSCLES Self stretches Gripping a tennis ball Lumbricales Dorsal interossei Abductor digiti minimi Palmar view First dorsal interosseous Dorsal view Dorsal view Second dorsal interosseous Dorsal view Abductor digiti minimi
19 SMALL HAND MUSCLES 149 Latin, dorsal, back; interosseus, between bones; lumbrical, earthworm; abductor, away from; digit, finger; minimi, smallest. Comprising: dorsal interossei, lumbricales, and abductor digiti minimi. The four dorsal interossei are about twice the size of the palmar interossei. The lumbricales compose of small cylindrical muscles, one for each finger. Abductor digiti minimi is the most superficial muscle of the hypothenar eminence. Origin Dorsal interossei: by two heads, each from adjacent sides of metacarpals. Lumbricales: tendons of flexor digitorum profundus in the palm. Abductor digiti minimi: pisiform bone. Tendon of flexor carpi ulnaris. Insertion Dorsal interossei: into the extensor expansion and to base of proximal phalanx. Lumbricales: lateral (radial) side of corresponding tendon of extensor digitorum, on the dorsum of the respective digits. Abductor digiti minimi: Ulna (medial) side of base of proximal phalanx of little finger. Action Dorsal interossei: abduct fingers away from middle finger. Assist in flexion of fingers at metacarpophalangeal joints. Lumbricales: extend the interphalangeal joints and simultaneously flex the metacarpophalangeal joints of the fingers. Abductor digiti minimi: abducts the little finger. Nerve Dorsal interossei: ulnar nerve, C8, T1. Lumbricales: lateral; median nerve, C(6), 7, 8, T1; medial; ulnar nerve, C(7), 8, T1. Abductor digiti minimi: ulnar nerve, C(7), 8, T1. Basic functional movement Example: Spreading fingers. Cupping your hand. Holding a large ball. Indications Finger pain and stiffness. Pain when pinching / gripping, associated with Heberdan s node(s), e.g. in professional musicians (esp. pianists). Arthritic finger pain, also seen in artists / sculptors. Referred pain patterns Lumbricales: pattern is similar to interossei. Abductor digiti minimi: pain in dorsum of little finger. First doral interossei: strong finger pain in dorsum of index finger (lateral half), with vague pain on palmar surface and dorsum of hand. Other dorsal interossei: referred pain to the specific associated finger. Differential diagnosis Cervical radiculopathy. Ulnar neuritis. Thoracic outlet syndrome. Digital nerve entrapment. Articular dysfunction. Also consider Intrinsic thumb muscles. Scalenes. Latissimus dorsi. Long finger flexors and / or extensors. Pectoralis major. Lateral and / or medial head of triceps brachii. Advice to patient Stretching and exercising. Examine work postures / ergonomics. Explore sporting activities (e.g. grip in golf). Use of ergonomic pens / cutlery. Techniques Spray and stretch Dry needling Injections Trigger point release
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